Java中Json字符串直接转换为对象的方法(包括多层List集合)

使用到的类：net.sf.json.JSONObject 

使用JSON时，除了要导入JSON网站上面下载的json-lib-2.2-jdk15.jar包之外，还必须有其它几个依赖包：commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar

下面是例子代码：

// JSON转换
JSONObject jsonObj = JSONObject.fromObject(jsonStrBody);

Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("results", WeatherBean_Baidu_City.class);
classMap.put("index", WeatherBean_Baidu_City_Index.class);
classMap.put("weather_data", WeatherBean_Baidu_City_Weatherdata.class);

// 将JSON转换成WeatherBean_Baidu
WeatherBean_Baidu weather = (WeatherBean_Baidu) JSONObject.toBean(jsonObj,
WeatherBean_Baidu.class, classMap);
System.out.println(weather.getResults());

使用到的几个JAVA类代码：

package com.lenovo.conference.entity.vo;

import java.io.Serializable;
import java.util.List;

/**
* 天气Bean
*
* @author SHANHY
*
*/
@SuppressWarnings("serial")
public class WeatherBean_Baidu implements Serializable {

private String error;//错误号
private String status;//状态值
private String date;//日期
private List<WeatherBean_Baidu_City> results;//城市天气预报集合（因为一次可以查询多个城市）

public WeatherBean_Baidu() {
super();
}

public String getError() {
return error;
}

public void setError(String error) {
this.error = error;
}

public String getStatus() {
return status;
}

public void setStatus(String status) {
this.status = status;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public List<WeatherBean_Baidu_City> getResults() {
return results;
}

public void setResults(List<WeatherBean_Baidu_City> results) {
this.results = results;
}

}

package com.lenovo.conference.entity.vo;

import java.io.Serializable;
import java.util.List;

/**
* 天气Bean
*
* @author SHANHY
*
*/
@SuppressWarnings("serial")
public class WeatherBean_Baidu_City implements Serializable {

private String currentCity;//城市名称
private String pm25;//pm2.5值
private List<WeatherBean_Baidu_City_Index> index;//指数集合
private List<WeatherBean_Baidu_City_Weatherdata> weather_data;//几天的天气集合

public WeatherBean_Baidu_City() {
super();
}

public String getCurrentCity() {
return currentCity;
}

public void setCurrentCity(String currentCity) {
this.currentCity = currentCity;
}

public String getPm25() {
return pm25;
}

public void setPm25(String pm25) {
this.pm25 = pm25;
}

public List<WeatherBean_Baidu_City_Index> getIndex() {
return index;
}

public void setIndex(List<WeatherBean_Baidu_City_Index> index) {
this.index = index;
}

public List<WeatherBean_Baidu_City_Weatherdata> getWeather_data() {
return weather_data;
}

public void setWeather_data(
List<WeatherBean_Baidu_City_Weatherdata> weather_data) {
this.weather_data = weather_data;
}

}

package com.lenovo.conference.entity.vo;

import java.io.Serializable;

/**
* 天气Bean
*
* @author SHANHY
*
*/
@SuppressWarnings("serial")
public class WeatherBean_Baidu_City_Weatherdata implements Serializable {

private String date;// 日期
private String dayPictureUrl;// 白天的天气图片
private String nightPictureUrl;// 晚上的天气图片
private String weather;// 天气
private String wind;// 风向
private String temperature;// 温度

public WeatherBean_Baidu_City_Weatherdata() {
super();
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public String getDayPictureUrl() {
return dayPictureUrl;
}

public void setDayPictureUrl(String dayPictureUrl) {
this.dayPictureUrl = dayPictureUrl;
}

public String getNightPictureUrl() {
return nightPictureUrl;
}

public void setNightPictureUrl(String nightPictureUrl) {
this.nightPictureUrl = nightPictureUrl;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

}

package com.lenovo.conference.entity.vo;

import java.io.Serializable;

/**
* 天气Bean
*
* @author SHANHY
*
*/
@SuppressWarnings("serial")
public class WeatherBean_Baidu_City_Index implements Serializable {

private String title;//标题
private String zs;//舒适度
private String tipt;//指数简述
private String des;//指数概述

public WeatherBean_Baidu_City_Index() {
super();
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getZs() {
return zs;
}

public void setZs(String zs) {
this.zs = zs;
}

public String getTipt() {
return tipt;
}

public void setTipt(String tipt) {
this.tipt = tipt;
}

public String getDes() {
return des;
}

public void setDes(String des) {
this.des = des;
}

}

例子中解析所对应的JSON字符串

{"error":0,"status":"success","date":"2015-01-15","results":[{"currentCity":"南京","pm25":"83","index":[{"title":"穿衣","zs":"较冷","tipt":"穿衣指数","des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},{"title":"洗车","zs":"较适宜","tipt":"洗车指数","des":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。"},{"title":"旅游","zs":"适宜","tipt":"旅游指数","des":"天气较好，气温稍低，会感觉稍微有点凉，不过也是个好天气哦。适宜旅游，可不要错过机会呦！"},{"title":"感冒","zs":"少发","tipt":"感冒指数","des":"各项气象条件适宜，无明显降温过程，发生感冒机率较低。"},{"title":"运动","zs":"较不宜","tipt":"运动指数","des":"阴天，且天气寒冷，推荐您在室内进行低强度运动；若坚持户外运动，请选择合适的运动并注意保暖。"},{"title":"紫外线强度","zs":"最弱","tipt":"紫外线强度指数","des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}],"weather_data":[{"date":"周四 01月15日 (实时：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/yin.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"阴转多云","wind":"北风微风","temperature":"8 ~ 4℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"多云转晴","wind":"西北风3-4级","temperature":"12 ~ 0℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"晴转多云","wind":"东北风3-4级","temperature":"8 ~ 0℃"},{"date":"周日","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/qing.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/qing.png","weather":"晴","wind":"西风微风","temperature":"10 ~ -1℃"}]},{"currentCity":"徐州","pm25":"154","index":[{"title":"穿衣","zs":"较冷","tipt":"穿衣指数","des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},{"title":"洗车","zs":"较适宜","tipt":"洗车指数","des":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。"},{"title":"旅游","zs":"适宜","tipt":"旅游指数","des":"天气较好，但丝毫不会影响您出行的心情。温度适宜又有微风相伴，适宜旅游。"},{"title":"感冒","zs":"较易发","tipt":"感冒指数","des":"天气较凉，较易发生感冒，请适当增加衣服。体质较弱的朋友尤其应该注意防护。"},{"title":"运动","zs":"较不宜","tipt":"运动指数","des":"天气较好，但考虑天气寒冷，推荐您进行各种室内运动，若在户外运动请注意保暖并做好准备活动。"},{"title":"紫外线强度","zs":"最弱","tipt":"紫外线强度指数","des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}],"weather_data":[{"date":"周四 01月15日 (实时：6℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"南风微风","temperature":"10 ~ 3℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"北风3-4级","temperature":"11 ~ -4℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"东风微风","temperature":"6 ~ -4℃"},{"date":"周日","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"西风3-4级","temperature":"11 ~ -1℃"}]}]}